You gave excellent examples with pyramids, vaccines, and large corporations. However, I would say that the largest beleif despite the evidence is (I don't wish to hurt someones feelings but:) religion.
BTW, "Chinese Whispers" is called "Gluvi Telefoni (ENG: Deaf Telephones)" in Serbia. : )
Yes that one baffles me, zero evidence, in fact overwhelming evidence to the contrary, yet people still believe. I know that all religion uses childhood indoctrination, however surely when you grow up you realise, oh, that was all complete bullshit, but alas no.
I long for the day when the entire human race is capable of critical thinking.
Cg